英文:
Calling super method after over-riding only possible by protected access without argument passing
问题
尝试理解Java面向对象编程（主要是Python编程者）。我无法在重写中从子类调用父类方法。
示例：
从子类支票账户（Checking account），我尝试重写父类方法，然后如果失败了调用super.method。
public String allowWithdraw(Integer amount) {
if (amount < this.withdrawalLimit) {
return "Yes";
} else {
return super.allowWithdraw(amount);
}
}
父类银行账户（Banking account）有allowWithdraw方法。
public String allowWithdraw(Integer amount) {
return "No, calling super";
}
这会导致语法错误建议的失败。如果我除了原始方法之外还有受保护的访问包方法，并且只有没有传递任何参数，该方法会被调用。我在这里查阅了资源，但无法弄清楚原因。
protected String allowWithdraw(Integer amount) {
return "No, calling super";
}
英文:
Trying to understand Java OOP (Python coder predominantly). I wasn't able to call parent class method from child class in the over-ride.
Example:
From Child class Checking account, I'm trying to over-ride parent method, and then if fails call super.method.
public String allowWithdraw(Integer amount) {
if (amount < this.withdrawalLimit) {
return "Yes";
} else {
return super.allowWithdraw(Integer amount);
}
}
Parent class Banking account has allowWithdraw method.
public String allowWithdraw(Integer amount) {
return "No, calling super";
}
This fails showing syntax error suggestions. If I have protected access package method additionally to the original one, the method gets called. And, only if there isn't any argument passing. I went through resources here, and I'm not able to figure out why.
protected String allowWithdraw(Integer amount) {
return "No, calling super";
}
答案1
得分: 1
你有
return super.allowWithdraw(amount);
在这里删除 Integer。你只需要在声明函数时指定数据类型，而不是在调用函数时指定。
英文:
You have
return super.allowWithdraw(Integer amount);
Remove Integer here. You only specify the data type when you declare the function, not when you call it.
通过集体智慧和协作来改善编程学习和解决问题的方式。致力于成为全球开发者共同参与的知识库，让每个人都能够通过互相帮助和分享经验来进步。
评论